TY  - RPRT
TI  - County-level estimates of nitrogen and phosphorus from animal manure for the conterminous United States, 2002
AU  - David K. Mueller
AU  - Jo Ann M. Gronberg
PY  - 2013
DO  - 10.3133/ofr20131065
UR  - https://pubs.usgs.gov/publication/ofr20131065
ID  - ofr20131065
ER  -